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| author |   Mark Brown <broonie@kernel.org> | 2022-09-13 15:11:01 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2022-09-16 12:40:58 +0100 |
| commit | ef939f30510b43e90f1fba30477b678107faeae7 (patch) | |
| tree | d9a88bd7370d70db3d0e9ff0300030384a1849e2 /tools/testing/selftests/arm64 | |
| parent | kselftest/arm64: Add SVE 2 to the tested hwcaps (diff) | |
| download | linux-dev-ef939f30510b43e90f1fba30477b678107faeae7.tar.xz linux-dev-ef939f30510b43e90f1fba30477b678107faeae7.zip | |
kselftest/arm64: Add hwcap test for RNG
Validate the RNG hwcap and make sure we don't generate a SIGILL reading
RNDR when it is reported.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220913141101.151400-4-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'tools/testing/selftests/arm64')
| -rw-r--r-- | tools/testing/selftests/arm64/abi/hwcap.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c index 6c91b4a0987e..d173e41f2123 100644 --- a/tools/testing/selftests/arm64/abi/hwcap.c +++ b/tools/testing/selftests/arm64/abi/hwcap.c @@ -33,6 +33,11 @@ */ typedef void (*sigill_fn)(void); +static void rng_sigill(void) +{ + asm volatile("mrs x0, S3_3_C2_C4_0" : : : "x0"); +} + static void sme_sigill(void) { /* RDSVL x0, #0 */ @@ -114,6 +119,13 @@ static const struct hwcap_data { bool sigill_reliable; } hwcaps[] = { { + .name = "RNG", + .at_hwcap = AT_HWCAP2, + .hwcap_bit = HWCAP2_RNG, + .cpuinfo = "rng", + .sigill_fn = rng_sigill, + }, + { .name = "SME", .at_hwcap = AT_HWCAP2, .hwcap_bit = HWCAP2_SME, |